1999 ford ranger 4.0

I bought a '99 Ranger for $1500. with over 200k miles on it in 2018. I only expected it to get me through one winter. I was happy and comfortable with it, and being my first truck, got a little sentimenntal. It lasted almost two years, and I decided to keep it goin. I spent over $3k on it, and...

My daughter has a 1999 Ford ranger 4.0 V6 XLT and it has been have trouble starts and runs still a rough idle now but when put in gear it stall and surges also stalls and surges at stop signs and light sometimes dies unless you keep the rpm’s up at 1000 here are the codes Po171 Po 174 P1131...